What you need, according to the folklore of many countries in Northern Europe, is a flying rowan. It's a rowan tree growing from bird droppings as an epiphyth on another tree. Oak is supposed to be best. But mind you, the flying rowan's powers are due to it never having touched the ground. The moment it does, it loses the spark.
I found a flying rowan today outside a subway station in western Stockholm. It was easy to spot, growing in the naked crown of a dead oak. Being a mechanistic materialist, I made no effort to take it. Only its picture. And besides, you're supposed to leave the first flying rowan you find alone. Somehow the second one's mystic powers are stronger.
[More blog entries about rowan, folklore, Sweden; rönn, flygrönn, folktro.]